Comment: The $5,000 pledges are probably legit

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In reply to comment: Fake Blimp Pledges (see in situ)

The $5,000 pledges are probably legit

You get a guaranteed ride on the blimp for a couple days if you give $5,000. The lower contribution levels only get you into a lottery for a limited number of tickets to ride on the blimp. I'd say that the extra incentive explains the jump in $5,000 donations.